The shortage of boron in rapeseed often causes flowering. The production practice has proved that the application of boron fertilizer at the flowering stage has obvious advantages: First, the effect of fertilizer is long. The correct application of boron fertilizer will not affect the growth of seedlings, but it can also be directly absorbed by seedlings to enhance the overwintering resistance of rapeseed. During the production process of rapeseed, increasing the amount of boron absorbed can meet the needs of later flowering and solidification, and no need to spray boron during the flowering period. The second is to increase labor efficiency. The application of boron fertilizer in the base fertilizer does not require additional labor, and the fertilizer effect is not affected by external conditions. The spraying of boron during the flowering period of rape can generally be sprayed twice. It takes a lot of time to work. If it rains after spraying, it needs re-spray. In case of bad weather, it will delay the timing. In the later period, Shimoda is affected by the plants, the operation is inconvenient, and the quality and effect of spraying. Difficult to guarantee. The third is to increase production significantly. According to the community test, the regional comparative test and the field production, the application of boron fertilizer can generally increase production by more than 35% compared with foliar spraying. Boron-containing fertilizers are mainly boric acid and borax. Boric acid contains 17% of boron, borax contains 11% of boron, and both are soluble in water. The need for boron in rape is a trace. Boron acid is applied at a rate of 0.25 to 0.35 kilograms for boric acid, and 0.35 to 0.5 kilograms for borax. The application of boron fertilizer is basically applied near the root system. Application method: The boron fertilizer, compound fertilizer and slag fertilizer, etc. are fully mixed and used as the base fertilizer acupoint application, so that the application does not produce side effects and the effect of increasing production is obvious.